%AFatemi, Valla%AFatemi, Valla%AWu, Sanfeng%AWu, Sanfeng%ACao, Yuan%ACao, Yuan%ABretheau, Landry%ABretheau, Landry%AGibson, Quinn%AGibson, Quinn%AWatanabe, Kenji%AWatanabe, Kenji%ATaniguchi, Takashi%ATaniguchi, Takashi%ACava, Robert%ACava, Robert%AJarillo-Herrero, Pablo%AJarillo-Herrero, Pablo%BJournal Name: Science; Journal Volume: 362; Journal Issue: 6417; Related Information: CHORUS Timestamp: 2020-02-05 20:06:17 %D2018%IAmerican Association for the Advancement of Science (AAAS) %JJournal Name: Science; Journal Volume: 362; Journal Issue: 6417; Related Information: CHORUS Timestamp: 2020-02-05 20:06:17 %K %MOSTI ID: 10080079 %PMedium: X %TElectrically tunable low-density superconductivity in a monolayer topological insulator %X

Turning on superconductivity in a topologically nontrivial insulator may provide a route to search for non-Abelian topological states. However, existing demonstrations of superconductor-insulator switches have involved only topologically trivial systems. Here we report reversible, in situ electrostatic on-off switching of superconductivity in the recently established quantum spin Hall insulator monolayer tungsten ditelluride (WTe2). Fabricated into a van der Waals field-effect transistor, the monolayer’s ground state can be continuously gate-tuned from the topological insulating to the superconducting state, with critical temperaturesTcup to ~1 kelvin. Our results establish monolayer WTe2as a material platform for engineering nanodevices that combine superconducting and topological phases of matter.

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